linux-kernel - [PATCH 3.10 23/23] ARM: 7938/1: OMAP4/highbank: Flush L2 cache before disabling

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Date:	Thu, 23 Jan 2014 10:39:56 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Rob Herring <rob.herring@...xeda.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Tony Lindgren <tony@...mide.com>,
	Taras Kondratiuk <taras.kondratiuk@...aro.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Wang Nan <wangnan0@...wei.com>
Subject: [PATCH 3.10 23/23] ARM: 7938/1: OMAP4/highbank: Flush L2 cache before disabling

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Taras Kondratiuk <taras.kondratiuk@...aro.org>

commit b25f3e1c358434bf850220e04f28eebfc45eb634 upstream.

Kexec disables outer cache before jumping to reboot code, but it doesn't
flush it explicitly. Flush is done implicitly inside of l2x0_disable().
But some SoC's override default .disable handler and don't flush cache.
This may lead to a corrupted memory during Kexec reboot on these
platforms.

This patch adds cache flush inside of OMAP4 and Highbank outer_cache.disable()
handlers to make it consistent with default l2x0_disable().

Acked-by: Rob Herring <rob.herring@...xeda.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>
Acked-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Taras Kondratiuk <taras.kondratiuk@...aro.org>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Cc: Wang Nan <wangnan0@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/mach-highbank/highbank.c  |    1 +
 arch/arm/mach-omap2/omap4-common.c |    1 +
 2 files changed, 2 insertions(+)

--- a/arch/arm/mach-highbank/highbank.c
+++ b/arch/arm/mach-highbank/highbank.c
@@ -68,6 +68,7 @@ void highbank_set_cpu_jump(int cpu, void
 #ifdef CONFIG_CACHE_L2X0
 static void highbank_l2x0_disable(void)
 {
+	outer_flush_all();
 	/* Disable PL310 L2 Cache controller */
 	highbank_smc1(0x102, 0x0);
 }
--- a/arch/arm/mach-omap2/omap4-common.c
+++ b/arch/arm/mach-omap2/omap4-common.c
@@ -162,6 +162,7 @@ void __iomem *omap4_get_l2cache_base(voi
 
 static void omap4_l2x0_disable(void)
 {
+	outer_flush_all();
 	/* Disable PL310 L2 Cache controller */
 	omap_smc1(0x102, 0x0);
 }


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